Air filter



FIG. 1 is a front perspective view of an air filter showing our newdesign;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right view thereof; and,

FIG. 7 is a rear view thereof.

The uneven-length broken line immediately adjacent to the shaded areadefines the bounds of the claimed design and forms no part of theclaimed design. The broken lines depicting the remainder of the airfilter form no part of the claimed design.

CLAIM The ornamental design for an air filter, as shown and described.